Error when fastinsert a table into DB vs no error if inserting only one row

Recently upgraded from 2016a to 2018a. Got an error in fastinsert. But if I insert only one row, there is no problem. Here is the command window: K>> fastinsert(obj.conn, tableName, colNames, test); Error using database.internal.utilities.DatabaseUtils.validateStruct (line 80) Input structure, dataset or table incorrectly formatted. See help for details

Error in database.jdbc.connection/fastinsert (line 153) data = database.internal.utilities.DatabaseUtils.validateStruct(data); K>> test = dataTbl(1,:); K>> fastinsert(obj.conn, tableName, colNames, test); How strange! Any one can help me figure it out?